QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/nc228027
USGS nc228027
17 Aug 1991, 20:29
30 km SSW of Scotia, California
A magnitude 6 ml earthquake at 8.3 km depth.
Published location
Where is 30 km SSW of Scotia, California?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
40.251667, -124.285833
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What the numbers mean
Magnitude measures event size; depth locates the source below the surface. Neither value alone establishes local damage or personal risk.
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Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
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Catalog fields and provenance
Event ID
nc228027
Coordinates
40.2516667, -124.2858333
Network
nc
Significance
554